tox: Use pre-commit for linter checks

We also add a .git-blame-ignore-revs file to ignore the application of
black.

Change-Id: I0522041dfc0b2d97c6a0648271626bab30322fd7
Signed-off-by: Stephen Finucane <sfinucan@redhat.com>

.git-blame-ignore-revs

@@ -0,0 +1,4 @@
+# You can configure git to automatically use this file with the following config:
+# git config --global blame.ignoreRevsFile .git-blame-ignore-revs
+
+7be7b1ab79814925f6d73ed97407ae19796ddd05  # Blacken code base

test-requirements.txt

@@ -7,6 +7,3 @@ coverage>=5.0 # Apache-2.0
 # sphinx is required in test-requirements in addition to doc/requirements
 # because there is a sphinx extension that has tests
 sphinx>=5.0.0 # BSD
-
-# Bandit security code scanner
-bandit>=1.1.0 # Apache-2.0

tox.ini

@@ -1,16 +1,13 @@
 [tox]
 minversion = 3.1.0
 envlist = py3,pep8
-ignore_basepython_conflict = True
 
 [testenv]
-basepython = python3
 setenv =
   VIRTUAL_ENV={envdir}
   OS_STDOUT_CAPTURE=1
   OS_STDERR_CAPTURE=1
   OS_TEST_TIMEOUT=60
-distribute = False
 commands =
   stestr run {posargs}
   stestr slowest
@@ -20,13 +17,13 @@ deps =
   -r{toxinidir}/requirements.txt
 
 [testenv:pep8]
+description =
+  Run style checks.
+skip_install = true
 deps =
-  -r{toxinidir}/test-requirements.txt
-  flake8
+  pre-commit
 commands =
-  flake8 cliff doc/source/conf.py setup.py
-  # Run security linter
-  bandit -c bandit.yaml -r cliff -x tests -n5
+  pre-commit run --all-files --show-diff-on-failure
 
 [testenv:venv]
 # TODO(modred) remove doc/requirements.txt once the openstack-build-sphinx-docs